Automating Manufacturing Systems - Process Control and ...

plc states - 12.51
6. Implement the State-Transition equations.in the figure below with ladder logic.
STA
T5
B
T4
D
STC
A
T2
STB
C
T3
T1
first scan (FS)
T1
=
FS
STA = ( STA + T2) ⋅ T5
T2
=
STB ⋅ A
STB = ( STB + T5 + T4 + T1) ⋅T2 ⋅T3
T3
=
STB ⋅ C
STC = ( STC + T3 ⋅ T2) ⋅ T4
T4
=
STC ⋅ D
T5
=
STA ⋅ B
7. Write ladder logic to implement the state diagram below using state transition equations.
FS
A
B
STA STB STC
C
C
8. Convert the following state diagram to ladder logic using a) an equation based method, b) a
www.PAControl.com